gscan2pdf / Bugs / #401 gscan2pdf gets stuck on process 1 of 2 while saving pdf

Joel Kolodziej - 2022-03-14

I have the same problem for the last week. Last line in debug log is

WARN - Error creating IM object - Exception 425: improper image header /tmp/gscan2pdf-AFpf/ML5lKwReDl.pnm' @ error/pnm.c/ReadPNMImage/342 WARN - *** unhandled exception in callback: *** Exception 425: improper image header/tmp/gscan2pdf-AFpf/ML5lKwReDl.pnm' @ error/pnm.c/ReadPNMImage/342 at /usr/share/perl5/vendor_perl/Gscan2pdf/Document.pm line 1023.
*** ignoring at /usr/lib/perl5/5.34/vendor_perl/Glib/Object/Introspection.pm line 67.

Googling about it seems this might be a glitch in ImageMagick. Since this is an unhandled exception, it seems to block everything else which comes after. I cannot even quit without killing the app/force close. I'm going to try with an older version of ImageMagic and see if that helps.

EDIT: The issue goes away if post-processing is turned off.

Last edit: Joel Kolodziej 2022-03-22

file.log

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- Petr Písař - 2022-04-04
  
  Does it happen to you every time? What kind of scan is it (black-white, gray, colorful)? Can you tell us a version of ImageMagick you have installed? Have you tried inspecting the reportedly malformed PNM file (/tmp/gscan2pdf-AFpf/ML5lKwReDl.pnm in that log output)? Can the PNM file be displayed with an image viewer? With "display" command of ImageMagick?
  
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  - Joel Kolodziej - 2022-04-05
    
    Yes, this happens every time. ImageMagick version is 7.1.0.27-1 from the extra repository on Manjaro. However, I cannot invoke it from the command line or from the KDE Plasma search. Best I can do is `_imagemagick' from the command line.
    Calling it from the CLI nets these errors:
    _tags:comptags:36: can only be called from completion function
    _tags:comptry:55: can only be called from completion function
    _tags:comptags:60: can only be called from completion function
    _tags:comptags:67: can only be called from completion function
    
    I've suspected there's something wrong with my imagemagick install, but I can't find any way to fix it. Reinstalling from pamac changes nothing.
    
    EDIT: Ok, it helps when you call it with the right command line. However, in my latest scan, none of the files it errors out on exist in the tmp folder. See log below in reply to Jeffrey Ratcliffe. The only pnm file that exists in the tmp folder is the first one fTL7Ii8DM4.pnm.
    
       /tmp/gscan2pdf-1xaR  ls -l  ✔ total 6972 -rw------- 1 crono141 crono141 0 Apr 5 19:40 BqtKv_0Od8.pid -rw------- 1 crono141 crono141 3733237 Apr 5 19:40 fTL7Ii8DM4.pnm -rw------- 1 crono141 crono141 1696021 Apr 5 19:40 GMXkb0Jgr9.png -rw------- 1 crono141 crono141 1696021 Apr 5 19:40 kVZe2HDyzx.png -rw-r--r-- 1 crono141 crono141 0 Apr 5 19:39 lockfile -rw-r--r-- 1 crono141 crono141 43 Apr 5 19:39 session
    
    gscan2pdf is still running, and stuck on processing 1 of 1 while checking the contents of the tmp folder.
    
    Last edit: Joel Kolodziej 2022-04-06
    
    file.log
    
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The step that produces the pnm in Joel's case is unpaper. Does activating the "Convert scanned images to PNG before further processing" in Edit/Preferences/General options make any difference?

I tried checking that this time and I still get the error.

INFO - New page filename /tmp/gscan2pdf-1xaR/kVZe2HDyzx.png, format Portable Network Graphics
INFO - New page written as /tmp/gscan2pdf-1xaR/oUDP1ezOcS.png (BEFBB9E0-B539-11EC-9AC9-D06C2EB305D4)
INFO - Converted /tmp/gscan2pdf-1xaR/fTL7Ii8DM4.pnm to /tmp/gscan2pdf-1xaR/oUDP1ezOcS.png
INFO - Replaced /tmp/gscan2pdf-1xaR/fTL7Ii8DM4.pnm (BE424DE8-B539-11EC-9AC9-D06C2EB305D4) at page 1 with /tmp/gscan2pdf-1xaR/GMXkb0Jgr9.png (BE424DE8-B539-11EC-9AC9-D06C2EB305D4), resolution 200,200
DEBUG - Converting /tmp/gscan2pdf-1xaR/GMXkb0Jgr9.png -> /tmp/gscan2pdf-1xaR/531XIAlAEe.pnm for unpaper
INFO - unpaper --black-threshold 0.33 --border-margin 0,0 --deskew-scan-direction left --layout single --output-pages 1 --white-threshold 0.9 --overwrite /tmp/gscan2pdf-1xaR/531XIAlAEe.pnm /tmp/gscan2pdf-1xaR/6iIePorGHt.pnm
INFO - Spawned PID 2935
INFO - Processing sheet #1: /tmp/gscan2pdf-1xaR/531XIAlAEe.pnm -> /tmp/gscan2pdf-1xaR/6iIePorGHt.pnm

INFO - New page filename /tmp/gscan2pdf-1xaR/6iIePorGHt.pnm, format Portable anymap
INFO - New page written as /tmp/gscan2pdf-1xaR/qms5IhTWYF.pnm (C12FAED8-B539-11EC-9AC9-D06C2EB305D4)
WARN - Error creating IM object - Exception 425: improper image header `/tmp/gscan2pdf-1xaR/nZiJEeLPuV.pnm' @ error/pnm.c/ReadPNMImage/342
WARN - *** unhandled exception in callback:
***   Exception 425: improper image header `/tmp/gscan2pdf-1xaR/nZiJEeLPuV.pnm' @ error/pnm.c/ReadPNMImage/342 at /usr/share/perl5/vendor_perl/Gscan2pdf/Document.pm line 1023.
***  ignoring at /usr/lib/perl5/5.34/vendor_perl/Glib/Object/Introspection.pm line 67.

Jeffrey Ratcliffe - 2022-04-06

gscan2pdf should also work with graphicsmagick + the compatibility layer for imagemagick. Can you give that a try? You already have graphicsmagick installed, I see.

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- Joel Kolodziej - 2022-04-12
  
  I don't know how to do this.
  
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Jeffrey Ratcliffe - 2022-09-28

Apologies for the delay in responding.

Debian-based distros offer a compatibility layer:

https://packages.debian.org/sid/graphicsmagick-imagemagick-compat

You seem to be using Manjaro, and I couldn't find a similar package for that distro.

Do you still have this problem?

If so, we can debug the imagemagick steps.

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- Joel Kolodziej - 2022-09-28
  
  I've since abandoned that install and moved to a new hardware and distro
  which doesn't suffer from this problem anymore. Thanks.
  
  On Wed, Sep 28, 2022, 4:12 AM Jeffrey Ratcliffe ra28145@users.sourceforge.net wrote:
  
  Apologies for the delay in responding.
  
  Debian-based distros offer a compatibility layer:
  
  https://packages.debian.org/sid/graphicsmagick-imagemagick-compat
  
  You seem to be using Manjaro, and I couldn't find a similar package for
  that distro.
  
  Do you still have this problem?
  
  If so, we can debug the imagemagick steps.
  
  [bugs:#401] https://sourceforge.net/p/gscan2pdf/bugs/401/ gscan2pdf
  gets stuck on process 1 of 2 while saving pdf*
  
  Status: open
  Group: v1.0_(example)
  Labels: saving pdf
  Created: Thu Mar 03, 2022 07:32 PM UTC by Allan McPherson
  Last Updated: Tue Apr 12, 2022 09:13 PM UTC
  Owner: nobody
  Attachments:
  
  debug.log
  https://sourceforge.net/p/gscan2pdf/bugs/401/attachment/debug.log
  (40 Bytes; text/x-log)
  
  I have some pages that I've scanned. I was able to print them without
  issue, but when I try to save them as a pdf, the status bar gets stuck on
  process 1 of 2 and it fails to create the file. I've attached a copy of my
  debug log.
  
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Jeffrey Ratcliffe - 2022-09-28

Thanks for responding.

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Jeffrey Ratcliffe - 2022-09-28

status: open --> closed-invalid
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gscan2pdf gets stuck on process 1 of 2 while saving pdf

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If so, we can debug the imagemagick steps.

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